linux-kernel - [PATCH 4/5] Added flush_disk to factor out common buffer cache flushing code.

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Date:	Thu, 08 May 2008 00:31:31 -0600
From:	Andrew Patterson <andrew.patterson@...com>
To:	linux-scsi@...r.kernel.org
Cc:	andrew.patterson@...com, linux-kernel@...r.kernel.org,
	viro@...iv.linux.org.uk, axboe@...nel.dk,
	andmike@...ux.vnet.ibm.com
Subject: [PATCH 4/5] Added flush_disk to factor out common buffer cache
	flushing code.

Added flush_disk to factor out common buffer cache flushing code.

We need to be able to flush the buffer cache for for more than
just when a disk is changed, so we factor out common cache flush code
in check_disk_change() to an internal flush_disk() routine.  This
routine will then be used for both disk changes and disk resizes (in a
later patch).

Include the disk name in the text indicating that there are busy
inodes on the device and increase the KERN severity of the message.

Signed-off-by: Andrew Patterson <andrew.patterson@...com>
---

 fs/block_dev.c |   33 ++++++++++++++++++++++++++++-----
 1 files changed, 28 insertions(+), 5 deletions(-)


diff --git a/fs/block_dev.c b/fs/block_dev.c
index 87014e6..eb2bc5c 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -867,6 +867,33 @@ struct block_device *open_by_devnum(dev_t dev, unsigned mode)
 
 EXPORT_SYMBOL(open_by_devnum);
 
+
+/**
+ * flush_disk - invalidates all buffer-cache entries on a disk
+ *
+ * @bdev:      struct block device to be flushed
+ *
+ * Invalidates all buffer-cache entries on a disk. It should be called
+ * when a disk has been changed -- either by a media change or online
+ * resize.
+ */
+static void flush_disk(struct block_device *bdev)
+{
+	if (__invalidate_device(bdev)) {
+		char name[BDEVNAME_SIZE] = "";
+
+		if (bdev->bd_disk)
+			disk_name(bdev->bd_disk, 0, name);
+		printk(KERN_WARNING "VFS: busy inodes on changed media %s\n",
+		       name);
+	}
+
+	if (!bdev->bd_disk)
+		return;
+	if (bdev->bd_disk->minors > 1)
+		bdev->bd_invalidated = 1;
+}
+
 /**
  * revalidate_disk - wrapper for lower-level driver's revalidate_disk
  *                   call-back
@@ -928,13 +955,9 @@ int check_disk_change(struct block_device *bdev)
 	if (!bdops->media_changed(bdev->bd_disk))
 		return 0;
 
-	if (__invalidate_device(bdev))
-		printk("VFS: busy inodes on changed media.\n");
-
+	flush_disk(bdev);
 	if (bdops->revalidate_disk)
 		bdops->revalidate_disk(bdev->bd_disk);
-	if (bdev->bd_disk->minors > 1)
-		bdev->bd_invalidated = 1;
 	return 1;
 }
 

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